Abstract
This chapter discusses the initiation of crack propagation in ductile structures. Two types of thin structures of structural elements, namely, a center cracked plates from a single steel previously subjected to various degrees of strain hardening and spheres of different dimensions are used for crack propagation initiation. It is not possible to exceed the generalized plasticity load without this resulting at least in stable propagation of existing cracks. In most cases, stable propagation occurs before reaching generalized plasticity, but it seems possible, by using criteria of the equivalent energy, to predict with reasonable accuracy the load that causes propagation initiation at the lower of the two following loads: limit loading and loading calculated by means of a criterion of the J integral or equivalent energy type.
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